I noticed that the value for TotalRXPower is being returned times 10, where the value for Chain/Stream RX Power is correct:
# snmpwalk -v1 -c mycommunitystring 10.10.124.240 .1.3.6.1.4.1.43356.2.1.2.6.6
iso.3.6.1.4.1.43356.2.1.2.6.6.0 = INTEGER: -594
# snmpwalk -v1 -c mycommunitystring 10.10.124.240 .1.3.6.1.4.1.43356.2.1.2.6.1.1.3
iso.3.6.1.4.1.43356.2.1.2.6.1.1.3.1 = INTEGER: -63
iso.3.6.1.4.1.43356.2.1.2.6.1.1.3.2 = INTEGER: -62